We live in a Cooperative Senior building in Burnsville, Minnesota. A couple months ago we started noticing lag-time between when a remote button is pressed and the response time. This has gotten worse and worse. There are about 10 other residents here who experience the same probem.
Replaced the remote batteries
Re-booted both the modem and the router (several times now)
I just had to wait five minutes for the TV to change channels.
Sometimes, if I press Guide it never pops up at all. Sometimes, if I press the channel up/down button it responds but after a minute.
There is nothing wrong with the TV because the set in the office-room responds in the same fashion.
When everything works as it should (NOT VERY OFTEN) we always wonder when it's going to revert to the current situation.
The building needs a service call.